I'm leaning on that as well - A few things have me believing that it's the gateway running out of "something".
1) CGN2s worked fine - (I upgraded to CGN3 for the 20mbps upload rate)
2) Rebooting the router (or any other device on my network) does not resolve the issue; rebooting the gateway device resolves the issue immediately.
What I'd really like to know is how many people running CGN3s on the rogers network actually run it in bridge mode, and out of those, how many have this problem. Obviously these forums aren't a good sample space as the people with problems will tend to stick out, while the people without the problems don't tend on posting.
I need to figure out if it's worth my time exchanging for another CGN3, or until I get a good one; or should I revert back to the CGN2/Cisco gateways until an alternative devce for the 250/25mbps or a fix is available.
L.